阿联酋超大型地震勘探项目采集技术规划与集成

Planning and integration of acquisition technologies for ultralarge seismic exploration project, the United Arab Emirates

2018年7月19日,中国石油东方地球物理公司与阿联酋阿布扎比国家石油公司签订了勘探史上迄今最大的一个全三维勘探服务合同,勘探总面积达53 000 km^2,包含海、陆两部分;项目涵盖区域地表情况复杂多变,勘探层系多且深(3000~9000m),主要勘探目标为深部非常规油气的地层,成像精度要求高。针对此类超大型重点工程,采用了“分区划块、合而为一”策略:①在超大区域内根据地表与勘探目标的变化,统筹规划勘探片区,分片采用不同的装备配置;②不同区域根据实际情况再次划块,精确选择不同的优化采集方案,实现全勘探区域宽频、高密度、大偏移距、全方位地震采集;③针对海陆条件制定不同的高效采集方案,并采用稀疏反演分离方法来确保海陆高效混叠采集质量;④复杂浅海区域采用新型MASS节点,解决了由浅水区地形起伏引起的耦合问题和浅水区的环保问题。结果表明:超大型地震勘探项目的成功运作,需要提前规划、统筹协调和集成综合性的技术应用,该案例探索出一条大型地震勘探项目的高效优质降本的实施之路。

On July 19th, 2018, CNPC Bureau of Geophysical Prospecting Inc.(BGP Inc.) and Abu Dhabi National Oil Co.(ADNOC) signed a full 3D service contract which is the largest one so far in exploration history. This contract involves offshore and onshore domains with total 53 000 km2. In this project area, surface situations are complicated and diverse, there are many layers with great burial depth ranging from 3 000 m to 9 000 m, and the main targets belong to those deeper unconventional strata. For the sake of strict imaging accuracy, the strategies on "zone-block division, and integration into one" were mapped out, including (1) to plan exploration zones overall according to surface and target variation and to apply different devices in different zones,(2) to subdivide blocks according to actual situation and to select an optimal acquisition scheme accurately, so as to realize omnibearing seismic acquisition of wide frequency, high density, and large offset,(3) to formulate high-efficiency acquisition schemes for specific offshore and onshore domains, and to make use of sparse inversion separation methods to guarantee efficient alias acquisition quality,(4) to adopt novel MASS node in those complex shallower seas in order to solve coupling problems induced by topographic relief and ensure friendly environment. In order to implement this ultralarge project very successfully, it’s necessary to make a planning in advance, carry out overall coordination, and integrate comprehensive technology. This project provides a practical way for other large seismic exploration projects with higher efficiency and better quality .